The basis of the cost of publicity on television media is:-

The cost of advertising on television media is primarily based on Time.

Key Points

• The cost of TV advertising is primarily determined by the time slot in which the advertisement is aired.
• Primetime slots (usually evening hours when viewership is highest) tend to be the most expensive.
• Additionally, the duration of the advertisement also impacts the cost - longer ads cost more.
• Other factors, such as the channel's popularity and the specific audience being targeted, also play a role in the cost.
• While aspects like production costs (quality of the ad, use of special effects, celebrity endorsements, etc.) and whether the ad is in color do influence the overall cost of a television campaign, they are not the basis for how TV stations charge for ad spots.
• The "place" could potentially impact cost if considering regional vs national campaigns, but again, the primary cost basis is time.